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制備超純水的方法
作者:重慶凈水器 ? 時間:2020-02-12 11:36:00
       傳統純水方法不能制出超純水,化學意義上純水(液態的H2O)的理論電導率為1813MΩ?cm。人們生產的純水達不到理論值,但18MΩ?cm似乎可以達到,對于這種水,有的稱為高純水,有的稱為超純水,目前還沒有系統的定義。也沒有劃分等級界限,筆者以為還是看電導率指標更準確一些?,F在制備超純水的方法是將各種純化水的新技術科學地結合起來,使生產超純水變得非常容易。目前市售的超純水器就是一個成功的例子。下面由重慶純水機載水一方為大家分享一下超純水器制備超純水的原理和步驟大體如下:

       (1)原水:可用自來水或普通蒸餾水或普通去離子水作原水。

       (2)機械過濾:通過砂芯濾板和纖維柱濾除機械雜質,如鐵銹和其他懸浮物等。

       (3)活性炭過濾:活性炭是廣譜吸附劑,可吸附氣體成分,如水中的余氯等。吸附細菌和某些過渡金屬等。氯氣能損害反滲透膜,因此應除盡。

       (4)反滲透膜過濾:可濾除95%以上的電解質和大分子化合物,包括膠體微粒和病毒等。由于絕大多數離子的去除,使離子交換柱的使用壽命大大延長。

       (5)紫外線消解:借助于短波(180~254nm)紫外線照射分解水中的不易被活性炭吸附的小有機化合物,如甲醇、乙醇等,使其轉變成CO2和水,以降低TOC的指標。

       (6)離子交換單元:已知混合離子交換床是除去水中離子的決定性手段。借助于多級混床獲得超純水也并不困難。但水的TOC指標主要來自樹脂床。因此,高質量的離子交換樹脂就成為成敗的關鍵。所謂高質量的樹脂,就是化學穩定性特別好,不分解,不含低聚物、單體和添加劑等的樹脂。“核工業級樹脂”大概就屬于這一類樹脂。對樹脂的要求是質量越高越好??上鴥群苌儆腥嗽谶@方面下工夫。滿足于生產大路貨。

       (7)012μm濾膜過濾,以除去水中的顆粒物到每毫升1個(小于012μm的),經過上述各步驟處理后生產出來的水就是超純水了。應能滿足各種儀器分析,高純分析,痕量分析等的要求,接近或達到電子級水的要求。

       以上就是重慶純水機載水一方小編為大家分享的全部內容,想要了解更多關于重慶純水機的相關資訊,請關注我們的網站,感謝大家的支持!
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